本研究之目的在於探討投資人於投資時過度自信程度受到投資人本身的工作表現中「工作績效」、「工作滿意度」、與「工作專業度」等成分，以及投資人的人口統計變項等因素的影響關係。
本研究使用問卷調查法收集資料。總共發出314份問卷，其中306人份有效問卷，為97.45％有效問卷回收率。此外，本研究透過敘述性統計分析、因素萃取、信度分析、效度分析、獨立樣本T檢定、單因子變異數分析以及迴歸分析來驗證本研究各項假說。
本研究結果顯示：投資人的過度自信與工作時的「工作績效」、「工作滿意度」、「工作專業度」有正向影響的關係。此外，「男性」、「有參與過公司的財務或投資決策工作經驗」、「研究所以上」、「金融業」的受試者在投資時的過度自信較其他受試者來的高。

The purpose of this study is to investigate the correlation between overconfident investment and work performance of investors. In this study, work performance is divided into three parts, including job performance, job satisfaction, and proficiency. This study uses questionnaire for data collection. A total of 314 questionnaires were distributed and 306 were valid, reaching a 97.45% of valid questionnaire recovery rate. Furthermore, this study applied descriptive statistical analysis, factor extraction, reliability and validity analysis, one sample t-test, one-way ANOVA, and regression analysis to verify the hypotheses.
The result of this study shows that overconfidence has positive relationship with job performance, job satisfaction, and proficiency of the investor. In addition, male, having investment working experience, higher education level, and working in finance industry are all characteristics subject to higher overconfidence in investment, comparing to other variables.

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